In this episode Walter played by John Noble asks Astrid "What are you thinking Watson?" While she is trying to crack a code. John Noble later went on to play Moreland Holmes, father of Sherlock Holmes in the TV Series Elementary.
For much of the earth's surface (it gets complicated as you near the poles) minutes of long. or lat. are about one mile apart. Even noting degrees, minutes and seconds of long. or lat. barely gets to within 100 feet.